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106. comrosmoas n T :iLJTOSS eOA we PLASTlC UNITED STATES Referenge PATENT OFFICE.

CORNELIUS E. HAYNES, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO AMOS L. WOOD, TRUSTEE, OF SAME PLACE.

COMPOUND FOR MAKING PAPER LEATHER-BOARD, 80C.

SPECIFICATION forming part of Letters Patent No. 377,072, dated anuary 31. 1888.

Application filed April 13, 1887. Serial No. 234.697. (No specimens.) I I 7 7 .To all whom it may concern:

Be it known that I, CORNELIUS E. Harms, of Boston, in the county of Sufiolk and State of Massachusetts, have invented a new and useful Improved Compound for Making Paper Leather-Board, &c., of which the following is a specification.

The object of my invention is to prepare a compound of such a nature that when it is o subjected to pressure, drainage, and desiccation a hard water and oil proof sheet is produced, which can be used as a substitute for paper leather-board, 8:0. I attain this object by using the following mixture, compounded substantially as per formula set forth.

In using my compound I do not need to use any prescribed form of apparatus, as my compound can be used in any of the paper or pulp machine or leather-board-making devices, yet

I have designed a special set of devices which together constitute an apparatus particularly adaptedfor using my compound, and for which I have made an application (of even date) for a patent.

My formula is as follows: For making a thousand parts, by weight, I take of silicate of soda 1.42 parts; rosin, 1.42 parts; alum,

.76 parts; crude potassa, .40 partsfish- Inc 2.00 parts; water, 955.0 parts. Alter these ingredients are intimately mixed by grinding the solids and then stirring in water within the tank, I place within the tank sheets of copper and zinc to generate an electi ci h'li erfii'i al'aciron Ilien' me m assent-tsunami forqun e" was boiling temperatumconstantly agitated until the whole has formed an apparent chemical union, although in the form of an unstable compound. To the fluid thus formed I add thirty-nine parts of pulp and suflicient coloring-matter to give the required tint. The

compound is now ready to be treated in the same manner that ordinary paper'pul p is manipulated.

I claim- The herein-described composition of matter to be used for making paper leatherboard, &c., consisting of water, silicate of soda, rosin, alum, crude potassa, fish-glue, pulp, and coloring-matter, in the proportions and manner specified.

CORNELIUS E. HAYNES. Vitnesses:

Amos L. W001), FRANK G. PARKER.

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